Identical twins Speedo and Goslo join a migration from Earth to Planet X. Planet X is 20.0 light-years away from Earth in the frame at which they are both at rest. The twins, of the same age, depart at the same time on different spaceships. Speedo’s spaceship travels steadily at a speed of 0.90, and Goslo’s at 0.75. a. Calculate the age difference between the twins when Goslo’s spaceship reaches Planet X. Please draw the spacetime diagram with the answer. b. Which twin is older and why?

Identical twins Speedo and Goslo join a migration from Earth to Planet X. Planet X is 20.0 light-years away from Earth in the frame at which they are both at rest. The twins, of the same age, depart at the same time on different spaceships. Speedo’s spaceship travels steadily at a speed of 0.90, and Goslo’s at 0.75. a. Calculate the age difference between the twins when Goslo’s spaceship reaches Planet X. Please draw the spacetime diagram with the answer. b. Which twin is older and why?

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